Two species of narrowmouth frogs in the United States have mating calls that differ more in their region of sympatry than in those parts of their ranges that do not overlap.If this difference in their vocalizations has the function of preventing hybridization between the two species, it is an example of

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Reinforcement refers to the strengthening of prezygotic barriers to reproduction in order to prevent the formation of hybrids between closely related species. In this case, the difference in mating calls between the two narrowmouth frog species is stronger in the region where they both occur (i.e. sympatry), indicating that these differences have evolved to prevent hybridization and reinforce species boundaries. Neither of the other answer choices accurately describes this scenario.

Two Species of Narrowmouth Frogs in the United States Have